Every single episode with time travel in it.
MAKE UP YOUR FUCKING MIND.
Exhibit 1:
Janeway and some of the crew go to a planet and find out a major explosion killed every living being on it only a day ago.
They get sucked into a rift and are now a few hours before the explosion.
B'Eleana tries to save them, CAPTAIN REALIZES THE ATTEMPT TO SAVE THEM ACTUALLY LEADS TO THE EXPLOSION, STOPS THE ATTEMPT.
BOOM, everything's back to normal, they never went to the planet because there was nothing to investigate, etc.
That's an instance of when they DIDN'T fuck up.
Now comes an example of when they DID.
Exhibit 2:
Temporal disruption, ship from 29th century tries to destroy voyager because it's convinced that Voyager will cause the entire solar system to explode.
The attack causes both the 29th century ship and Voyager to land in 90's LA, California.
29th century ship's captain finds out it wasn't Voyager that caused the big explosion, but his own ship. It's now in the hands of a big company CEO who doesn't know how to calibrate the settings on it, which will cause the explosion in his time.
JANEWAY SAVES THE DAY, SHIP IS NOT GOING TO JUMP BACK TO ITS OWN TIME ANYMORE. EVERYONE STILL REMEMBERS EVERYTHING THEY DID. 29th CENTURY SHIP APPEARS AND ASKS VOYAGER TO FOLLOW IT THROUGH THE TIME RIFT IT JUST CREATED TO GET BACK TO THE 24th CENTURY.
What the FUCK.
IF THE FUCKING SHIP DIDN'T CAUSE THE EXPLOSION IN THE 29th CENTURY, ITS CAPTAIN WOULDN'T HAVE TRIED TO DESTROY VOYAGER, WHICH WOULD MEAN THEY WOULDN'T HAVE BONE BACK TO THE 20th CENTURY, WHICH MEANS THE CEO WOULD NEVER HAVE HAD THE SHIP, WHICH MEANS THE EXPLOSION STILL WOULDN'T HAPPEN.
THERE IS NOTHING PARADOXICAL ABOUT THIS. IT'S SIMPLE LOGIC. WHO FUCKING WROTE THAT SHIT?